system tests for policies
tests for multiple policy execution
Changed teardown to delete groups
removed delete servers script
more tests
fixed lint error
(dreid, alex) Fixed a bug with adding a server to multiple load balancers.

The callback that was added formed a closure over information about the load
balancer however due to the way binding of names in closed scopes works in
Python, every callback would receive the value from the last load balancer.
started delete_events
Add an extra line break for clarity and use lb_id for consistency.
Merge pull request #225 from rackerlabs/fix-multiple-load-balancers

(dreid, alex) Fixed a bug with adding a server to multiple load balancers.
Force the region to DFW.
Merge pull request #228 from rackerlabs/force-artifact-region

Force the artifact region to DFW.
deleting based on policy_id
Merge branch 'master' into delete_schedule_event
delete_events takes list of policy ids

also, removed few unnecessary setup in tests
using params instead of expanding cql in code
values dict should not have ':'
Real delete one webhook
policies system test's reviews incorporated
Merge pull request #221 from rackerlabs/policy_system_tests

Policy system tests (ready for review)